1 Welcome to version 0.07a of the Regina Rexx interpreter.
3 But first, the copyright and copying conditions. The code is
4 'copylefted', which means that it is copyrighted, but that you are
5 allowed to use, copy, modify, redistribute and sell the code, under
6 the conditions listed in the "GNU Library General Public License". See
7 the file COPYING-LIB for more information.
9 Note that this has changed since version 0.06, which was covered by
10 the 'ordinary' GPL. The reason for the change is simply that Regina is
11 becoming more and more library-like, and the LGPL seemed more
12 appropriate than the GPL.
14 The source has been built and tested on several platforms. Generally,
15 'all' you need a Standard C compiler (i.e. ANSI C), a 'lex' program
16 and a 'yacc' program. In addition, your machine should be POSIX
17 compliant. The latest version of Regina is stored on the anonymous ftp
18 site ftp.pvv.unit.no (129.241.36.200), in the '/pub/regina' directory.
20 To build the interpreter:
22 1) Edit the Makefiles (in particular the one in the 'src' subdirectory,
23 and uncomment a suitable definition of the macros CC and CEXTRA.
24 You may want to make a new one if none of the existing ones fit
27 2) Run the command make
29 If you like to make the dynamic library curses.rxlib, then you must
30 issue the command make curses.rxlib while in the src subdirectory.
31 Note that dynamic loading of libraries will not work on all systems.
33 3) The Makefile does not install targets. There is a make-target
34 'install', which installs programs. Check the settings of macros in
35 the makefile before running make for target 'install'.
37 4) You might want to run the documentation through the LaTeX
38 textformatter. If you don't have the 'block' and 'a4' style
39 options for tex (these are not standard LaTeX options), just
40 edit them out, letting the first line become:
42 \documentstyle{report}
44 Preformatted version of the documentation is supposed to be
45 available from flipper in the directory 'pub/rexx/doc', there is
46 one file which contains the whole documentation as a PostScript
47 document. In addition, there is a set of ASCII files, which is the
48 preformatted version, divided by chapters.
50 There are sometimes problems when compiling Regina under SunOS. The
51 main problem is that SunOS is one of few Unix systems still in use which
52 is neither POSIX nor ANSI. Note that Solaris is OK. But SunOS 4.1.1 has
53 the following problems:
55 * Lacks the memmove() function; use bcopy() instead
56 * Lacks the strerror() function; access sys_errlist[] directrly for
59 There are several other omisions and bugs in the include file of SunOS,
60 but the rest of them are likely to 'just' generate warnings. The two
61 above, however, _must_ be fixed if compilation shall succeed. If the
62 preprocessor symbol SunKludges is defined, these two problems are
63 automatically fixed in config.h; however, that fix may not suit all
66 In general, this depends on the interpreter you are using. Some
67 versions of gcc (at least 2.5.2) will declare strerror() and
68 memmove(); thus an error is provoked if compiled with SunKludges.
69 Also, there are some other problems, like the SEEK_{SET,END,CUR}
70 macros not being defined.
72 Also, SunOS has a bug, the _file member of FILE has type char, but
73 fileno() should return an integer or -1 if error. However, if your
74 max-number-of-files limit exceeds 128, fileno() will return -128 as
75 file descriptor. Obviously, this is incorrect, and obviously, this can
76 not be fixed by casting fileno() to unsigned char (it would be
77 incompatible and then -1 and 255 would overlap). You should (a)
78 complain about this to your SunOS vendor, and (b) never set the max
79 open files limit higher than 128. I've tried to circumvent it by
80 casting the return value from fileno to unsigned char. But it doesn't
81 seem to work, probably because other I/O functions use _file without
82 taking any precautions. Thus, you should never use max open files
83 greater than 128 under SunOS; else, bad things will happen, both in
84 Regina and in other programs. (Use limit or ulimit to display/set
87 If you want to compile it for VMS, you need a lex and a yacc program.
88 You can get the GNU versions of these tools, or you can run the lex
89 and yacc on another machine, and copy the results of these programs
90 from that machine. Unfortunately, I've not been able to test the VMS
91 version for some time now, so it might need some 'help' to compile
94 I have built it on the following platforms:
96 - gcc, lex and yacc on a Uniline 88
97 - gcc, lex and yacc on Sun 3
98 - c89 (unbundled), lex and yacc on Decstation 5000, under Ultrix 4.2
99 - cc, lex and yacc on Irix Indigo and Onyx, under IRIX 4 and 5
100 - acc (unbundled), lex and yacc on Sun Sparc, under Sunos 4.2
101 - cc, lex and yacc on Decstation 3100, under OSF/1
102 - c89, lex and yacc on HP 9000, under HP/UX 8.05
103 - cc, lex and yacc on IBM RS6000 under AIX
104 - cc, lex and yacc on Cray under UNICOS
105 - cc, lex and yacc on Linux 0.99
106 - cc on a VAX/VMS, getting yacc and lex output from a Sun.
107 - cc, lex and yacc on a DEC alpha running OSF/1
109 Read the file README.VMS to get more information about how to build
110 Regina on a computer running VMS, and what functionality is present in
111 the VMS version of Regina. In addition to VMS and Unix, this version
112 of Regina has also been successfully built for OS/2 and MS-DOS, using
113 the EMX development environment under OS/2. However, Regina does not
114 yet have any specific support for these systems.
116 This version of Regina also has support for dynamic loading of object
117 files. I.e. that you can load an object module containing definitions
118 for extra 'built-in' functions. This interface uses the same interface
119 as the RXFUNCADD(), RXFUNCDROP() and RXFUNCQUERY() functions in SAA
120 Rexx. Only one library of extra functions are available, it is a
121 curses interface library (although not all curses functions are
122 implemented in it yet.) To load these function into the interpreter,
125 lib = './curses.rxlib'
126 if rxfuncadd('CURSES', '/path/curses.rxlib', 'curses') then do
127 say 'An error occured when trying to load the library: "'lib'"'
128 say 'The error message returned was: "'rxfuncerrmsg()'"'
135 Actually, this 'just' loads and executes a function CURSES() in the
136 library. However, this special function will load all the other
137 functions in the library. The parameter given to CURSES() is the
138 prefix to prepend on all function names. See the file hanoi.rexx in
139 the code directory for an example.
141 Note that dynamic linking is only supported for those. Also note the
142 the normal 'make' setup will not by default compile the curses
143 library. To do that, do:
147 after having made the rest of Regina.
149 If you are unable to get Regina to work on your computer, because you
150 don't have one or several of the programs needed to build it, you can
151 try to build the GNU tools on your computer. Regina will compile with
152 these tools (and using them is a good idea anyway). You can get them
153 by anonymous ftp from prep.ai.mit.edu, ugle.unit.no and several other
156 The areas where it is not POSIX compliant are:
158 - It uses "struct timeval" and gettimeofday(). You can control
159 this through the HAS_TIMEVAL option in config.h. Comment it out
160 if your machine does not eat the code. Consequences: The
161 interpreter will have a time granularity of 1 second.
163 - It uses ftruncate(). If you do not have that, comment out the
164 HAS_FTRUNCATE option on config.h. Consequences: When writing to
165 the middle of a file with lineout(), the file will not be
166 truncated after the line written.
168 - It uses putenv() to set an environment variable. While POSIX do
169 have the getenv() call, it does not have a way of setting
170 environment variables. Fortunately, most machines have a way of
171 doing this, but you might have to link in an extra library or
172 something. If you can't find a putenv() on your machine, you can
173 undefine the HAS_PUTENV macro in config.h. Consequences: Trying
174 to set en environment variable will cause a syntax error
176 The interpreter has bugs and missing feature. I consider this release
177 of Regina a beta release, and I will continue to do so, until:
179 - Regina is a full implementation of Rexx as described in the book:
180 "The Rexx Language", by Mike Cowlishaw;
182 - the most important extensions from CMS have been implemented;
184 - a full implementation of the Rexx SAA API, as documented for
185 OS/2, has been implemented;
187 - all important extensions suggested by the ANSI Rexx committee
188 have been implemented;
190 - an extensive test suite which test most parts of the features
191 listed above have been implemented, and Regina is able to run it
192 without problems; and
194 - the documentation for Regina has been completed.
196 If you find bugs or incompatibilities, please send me e-mail
197 describing the bug. It is important that your bugreport contains:
199 - Description of what equipment you used, i.e. hardware
200 platform, operating system, compiler version, compiler
201 options used, version of Regina etc.
203 - A description of the buggy behavior (and the behavior that
204 you expected to see).
206 - Preferably a program that demonstrates the behavior. The
207 program should be as small as possible, preferably not more
210 - If you have already fixed the bug, please append a context
211 diff of the changes you made to the source.
213 Please make sure that the bug is really a bug in the interpreter, not
214 just a bug in your program. And also make sure that you've got the
215 latest release of Regina. If possible, run your program on other REXX
216 interpreters to see how they behave, and check with a REXX manual if
217 you have access to one. Bugreports are welcome, as well as other types
218 of comments. You can send bugreports directly to my email address,
221 There are four subdirectories.
223 - The first is 'trip' which is the start of a "triptest" for a REXX
224 interpreter, which is supposed to test most REXX interpreter
225 features. If enough tests are gathered in this triptest, any
226 REXX interpreter that manages to run it would be fairly REXX
227 compatible. Such a trip test is not a perfect way of ensuring
228 compatibility, but it is far better than none.
230 - The next subdirectory is the 'demo', which contains some small
231 demo programs for REXX, mainly demonstrations of special
232 programming features in REXX. Also included are some common test
233 programs and routines distributed on the net. Note that the
234 programs in this directory are not covered by the GPL.
236 - The src directory, containing the source code for Regina.
238 - The 'doc' subdirectory, containing the documentation for Regina.
239 Unfortunately, this documentation is not complete, nor it is
240 completely correct at the moment, since I want to finish the
241 coding before continuing the work in the doc.
243 Some of the things the interpreter does not have:
245 - The documentation is far from finished. It has lower priority
246 for the moment, until I have finished the interpreter itself.
248 - For the (external) commands, there is not a consistent shell in
249 the background to which commands are sent. Instead either there
250 is a shell that is started up each time (ADDRESS SYSTEM), or the
251 command is run directly (ADDRESS PATH and COMMAND). This will
254 - I still need to test a lot of functionality that has been
255 implemented and are supposed to work.
257 - Lots of other things ...
259 There is a mailing list for announcements of new versions of Regina.
260 If you want to be on that list, send a request to be put on the list
261 to the address: <rexx-request@pvv.unit.no>
263 Anders Christensen e-mail: anders@pvv.unit.no
266 N-7034 Trondheim, Norway